<template>
    <div class="cmt-container">
    <h3>发表评论</h3>
    <hr>
    <textarea placeholder="请输入要BB的内容（做多吐槽120字）" maxlength="120" v-model="msg"></textarea>

    <mt-button type="primary" size="large" @click="postComments">发表评论</mt-button>

    <div class="cmt-list">
      <div class="cmt-item" v-for="(item,i) in cmts" :key="item.id">
        <div class="cmt-title">
         
          第{{i+1}}楼&nbsp;&nbsp;用户：{{ item.username }}&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat }}
        </div>
        <div class="cmt-body">
            {{ item.content }}
        </div>
      </div>

    </div>
    <!-- 声明一个方法getMore 在方法中调用getComments() -->
    <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
  </div>
</template>
<script>
  export default {
    data(){
      return {
        cmts:[],//自定义一个变量接收 后台获取到的数据
        msg:""
      }
    },
    created() {
      // this.getComments();
      this.cmts = JSON.parse(localStorage.getItem("cmt") || '[]')
    },
    methods:{
      getComments(){
        this.$http.get("comment.json").then(data =>{
          if(data.body){
            console.log(data.body);
            this.cmts = this.cmts.concat(data.body);// concat 拼接; 将获取到的数据拼接到数组中
          }else{
            Toast("加载评论失败!!!");
          }
        })
      },
      //加载更多
      getMore(){
        this.getComments();
      },
      //发表评论
      postComments(){
          //从本地存储中获取数据
          if(this.msg.trim() == "") return Toast("说点什么吧!!!!!!");

          var newlist = JSON.parse(localStorage.getItem("cmt") || '[]');

          var obj = {id:new Date(),add_time: new Date(),username:"匿名用户",content: this.msg}

          newlist.unshift(obj); //把评价的信息添加数组中

          // this.cmts = [...newlist,...this.cmts];
          this.cmts = newlist;

          localStorage.setItem("cmt",JSON.stringify(newlist));//将数组存到本地存储中
          this.msg="";
      }
    }
  }
</script>

<style lang="scss" scoped>
.cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }

  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        line-height: 30px;
        background-color: #ccc;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>